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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b12c2cf30c2398e9b4b9d94c01b8ce7eae5d6b5107eeceed3482320f2e6847c' 
  AND token = '7UM/oyq6J521G09wBeGGLpy8kic9eopS5BvS7c9DZ7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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