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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda10df569da46a963065b63436b2c7c59643ae632062d4a1f9f0c38082624e3' 
  AND token = '9PN1bcEKc5PWJDxesY5lJJZMfK+CyEvSiXW8LEzcsRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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