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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90d8de7d4797a0ae77ae08a7e95aeca816b99ad52d725c014f43e9e39f26e82' 
  AND token = '+sHetp3JX3t/M5u/WIViFbv4sqBwAs28YwjqL8dWEY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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