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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c29c383996919c675237cdf9e0e4229f59721026b96b38b5f29eac9e0657801' 
  AND token = 'xkX8t4tID9wEmsb9oQde28UxGFGLpxkQhkJXu2fqON8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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