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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c667df07d98dc9eefb3f65fded4c9e3aa81e270ad33962bcc3d88a16533de8e5' 
  AND token = 'QRA98l0iFjkF3AAT1/9MBtgPQuKs0V21PG6WEek+1l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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