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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f55d67810844cbd5d373dedd07f47cfdab4823e8a5ab62768b2a05b26a7ed40' 
  AND token = 'r/wqytWm1e8/fRdM2ivXbCfQDo6w/EO+fQGsJXM/2pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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