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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda30a7a66fc03447ede7c29c49082be1d7c90e75b6d655e89db5f1c68860582' 
  AND token = 'ChX461NX0B1Z6Io2uvIxiW6zSxNdlqkE58+9la4ToYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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