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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510cd0d62b353425e0b632922e5a8374ac1c0ccd1a9f23c879e965d048f98cdc' 
  AND token = 'ADfWhFKaLDjg6CQoeFR9BN5ApZ87JLVEQR4zTfBI5rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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