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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce80046a430b0a5b48ba7dba029e95c5177fe2986ed3fb392af2da0a21af834d' 
  AND token = '/X9bAFmMfNqcLoUuT/rusONzrsUHkV1dAC7MzQU4LyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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