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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e337d7caa4dc42d162e2b0ab98c369e176b28d35040ec67e184cd567f1edea' 
  AND token = 'nzzH70VVWnW5JKfALDMdmh0FKpqoOcT+uhV49Acakls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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