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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4ac7b193818fbd13df144b4dfbaddd605b504b8d69eac46b0e1260717dcdbd' 
  AND token = 'iqVfbuet+Sym0YQra8ASRQS5KaKG5Z8PUgX0xEjg9HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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