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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec2e308b33d3606ddf7a23339fe0e2593cc023a3bdf2dfa14b9a036aa801a56' 
  AND token = 'dfF0iROKosc7oq2FKkQDrTgs3cusdoLe/3mfESOks98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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