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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f962bb35dd389c96898e8092f9a0b0b6efc34f69d66054ac51fe21fd2375afe4' 
  AND token = 'UYlVw7+7z9dfp62pMXIs1loGML1RaStsjaT5X9uT1CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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