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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d892728e750949a9740c3db89df24829252e12b1bde45de53c7a94c4b90c9e' 
  AND token = 'bWiZNrG81j+myNwW1ANmP9g9kunCUeTDSltxuV8eF2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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