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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afaa3205e946edafb1642cf47b7978bfb03b455df0cf3a3fd937b0f5394e25f6' 
  AND token = 'Bng+c7aEHaxp7Dy4peF4hFpkI0RlxVZdB0pJY4q4lhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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