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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c85a2210a48cd550af20e8e0eee3595dbd9b30603f289701723cdea52af3df4' 
  AND token = 'OAm6HeZKoA84fAOqbm+cw7ty+YhkJ8reMnFQiNv4W/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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