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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4beb5a895ef7bc45d8e83dd94517eec3996229985b1475245b1fad796271076d' 
  AND token = 'VW62FcuphaL2jFv43RWGKBkuktd/ZScnmodhWMeuv8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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