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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91dfdbef188dc34421b052323cc46c245ebe6dab70b3b1e3c3ef1ead3a59ed8' 
  AND token = 'f+iWa68sWQLV1Lxxkx12ip1ztwNg0iePJaPYc0+b9M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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