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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c167e2b12bfe600e5cc864d2ba70e521595a6c611fca1a5c7f76cc7c1ec57a78' 
  AND token = 'X/2nLUJXfsOdQqnSVFmt4C/oNqUMP0fGKu775RMuw3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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