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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0470fbd4940b02ef7241e767349704add5c7164545008d298d17f0eb9e1f884' 
  AND token = 'Ct9yCOzz4BVkDnc99jaMKSl48Z8dvGlCvtuuL85Cxbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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