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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69ecfbfaee47ccbf0dbeef48925ced3de0c2b9d3df16fcea817a0e4e1ed8954' 
  AND token = 'h2IN34GYX5l0P6ZuxAiKV8f7QCRF+UGcDSJH8gMyy4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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