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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f871e385cf568ccea0f4da62eba93dc978db9470966557cf8d2538d71ae067e' 
  AND token = '8CQgL7RPGd4FTykn4+7ygyehtp49p6W6T8WZGbJA+S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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