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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c962f2e42ed66fd479e934fa033af13db9aaf463f86116bd5c4f4261c60cace0' 
  AND token = 'jAX3w7u56vSO/LbnkyZAYEwePDEHV060JBFewF0Q7YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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