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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e119b83de08de3aa7d0f5456f63fb7e7cf61a77a61baac88ee6848a665d333bb' 
  AND token = 'NngHHNCJZLdw8x+5zyXqRULE1BTcPjwoApxNGh4Ge3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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