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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a338c6925ffe0b0266c618cb1faeb91a515be7073adefa152e190cb962a9a29f' 
  AND token = 'jU2cQa80Y2MvjuQdCf7SRZKo5bg3mqt5LkYHoPthts8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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