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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78cad8bb0c9c99b98a6340b6bdf3164d31e5633c99456e5b257abbf1a899aaae' 
  AND token = 'FMOiwVf7MSII/pcrKnlbCsQHJaCC0QNel92t8KERm5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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