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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7643730f5258f10235e8f512257d5b5094f045e3b5792d2d0e6bcf38d4b29c' 
  AND token = 'RKXl23VkIXgXAHRysq1eoaJpjmsrd7K6vq0ccW9sYs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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