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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2168985047ad676f38660dd75f2e0f35b83ec0e41f064a8902e840332bc27994' 
  AND token = 'yN9BAX5NnciD9O4Hll+Lv9S/FYBufVVivA8067s9P0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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