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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a134c791515d7f4aeedabfc9630a14dedf0f8ab81f0b02c39e84b223ec8418' 
  AND token = 'oMNtvLDTPKoYfgx+AX0LA3gyA6d/uNfJlZY45ZEyE6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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