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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41b099d71161d1594efc36106697e88bf8c306b42f593a418e4290fc4a2623f' 
  AND token = 'r7Ie8koEyyUSVcR+KRlMbuEYE+aM/rOrIpi9X+fHdJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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