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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4b2d6bf58a52e0a5cc6e6bb1f9e9b9e497e8cfdacffac5472039bce68e72e0' 
  AND token = '1BYClvDJchOl5Yxyp1oLnMMTgHbeSIIIHOjaa30tvfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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