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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68693d34c1a8450c647c0109f82f835c4e638c955f3b80e14f4bd4c35d7ce75' 
  AND token = '9d33MZgHNTTcDncX3MZtGb9sP6V7946RKkomP2PyOaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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