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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f7b960f2e33d5b51ca45f3086a966ae98ab8719b07add3eb715d209518a859' 
  AND token = 'XJ0877RxFf+faUerhczrRQ/FjI7O6zi2d2vekFOL4ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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