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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fca80864001bb13f545ca5c20587b26fede31a1e2442de8019b19646fe8eac' 
  AND token = 'B9Co8+wawFHsQusR93rNBZjNBWu2ExbwzqUqM1kbxD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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