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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955b442301ebbe077c7c6c2f347f0fbfccfc916df2b38e982143acc950cb0aa9' 
  AND token = '+4MszmWfkzfKgwtKLioY51NkZVNE7L245dpj496ynhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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