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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4beb6e0e293d812c2bbd4abdd9b90e8bc0add70cae33b49a6807b17c83dbe8c' 
  AND token = 'cPyT1G+Ghd5iacei+EZR3PvESgGnqqImZRzTadeBmtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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