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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7c66391fec6002f71b0928a4eeae6ef669f51d9adac984f764f225c13f862b' 
  AND token = 'i0a2+Dp67PUWTcUeoWur8WDGyIfphfBvrfzV0UW6xnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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