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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476c214c1a27877fe829e9d8c0e9b51168c5095ed2d63651d628e1c227f1a01b' 
  AND token = 'dButmKxB/ardNTNmvJTPt0Oi2zgcB51qmzEelGxzg6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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