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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43a5fd584130d200ae73a853e98e83448f8e5d62b8ff24d170ddfddd101c076' 
  AND token = 'Q4bpYKSe40mxV4WtFxdt5Ov2dEUQ7LDXLqq0F6IjXyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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