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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0f2413ff9e05387d84cfe15ae6eb138822817e50e6aec7524845fac0e02060' 
  AND token = 'TRcYU7ZWOqaqDL9+p/grwQEFjjeJbwkIff1bWXNKVRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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