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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbdadae5a4fa1eda8f458f9bf5fc3c848739513de57819649ba5fa0c96befb2' 
  AND token = '38iSXonr03DfbN9ASQjinPRWB+h+6MLcaXPoGJictt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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