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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abeb561b907dfc9c3b7f105e916aed3008716fac9fb50207c50948ede89777c8' 
  AND token = 'RHECcPIi76T66spWitPvqS7tuc8iPq/Ap7CPfvERtH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}