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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f0307f66ea7f6b2c2da2606f89662aee6b9f63efdfbc56c9be0837c5e35ab1' 
  AND token = 'CufjgcyerF4MEcup/IY3WzuBbN9pc0jdtIohupgb7ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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