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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4a445151464af004db8f34ccd7871d4aa68a32ee3a20929c92fccd5cb3e00f' 
  AND token = 'Ob3A3hosUXb6ULuhuv9PLac75SRyZp5PHwzK73Obrww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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