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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afa5e921990f1079cd5f888de4e48bddd1c5246335f9c82f314804866e742f9' 
  AND token = 'eZKEf0fOsytEY/pTPEc0m+xECzh9J5+oqlBGypFaJq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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