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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1673cca4c6311c2e916fb5185b35fc8c1d6bf2de24e61701977d6e1cddac12a' 
  AND token = 'hzrJgmFTux6vrgV7gVwnlFugL/4NnoOqc1SIx7i+rAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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