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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b5f38731972bc224fe03d3de80498842b0603592c5faddecfd408e0eabbd46' 
  AND token = 'ls5wp5iVWmn5bg05soG7ioN0toYLpZ7bHszRH/8gcJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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