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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcb61d1e8da764798b0677202ae5f3b31d9b00a97a74ebca209764e5102fa15' 
  AND token = 'gS8Q5eqOHWYENwjS5l/DHjd2hLT+8MYzbZerMDvI89I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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