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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa2490cfe6af631c723531520cd64da5f55726e0f9bf877911f9152aa4b49a0' 
  AND token = 'RlvnOU7xmQ+hMvjxA/rO2iASlbvo2sZ2ZfKOSvSCv9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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