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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3adad4cd72576a599c2b01aa6e7bd7e0c23a8b16ce45e1e4865dca3a361bd28' 
  AND token = 'Jc3Z9jiD/pGNzD9LSlMaGTBxwU3oMTCR+bM9RdJI3g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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