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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40eb377063127a2e99da22aa32e75ca4a35deabd1a7035cbecb2ca6984ef9ec' 
  AND token = 'ChKYm2zjUls2vgOb/n3MLk+dfSRl+FLVppVSD/5/6Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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