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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe2df43576b7d361638477b5cc2ac6c7f027a7b4a286df797d3f78384c2e378' 
  AND token = '0oaSTbmQqGoBYJZ/DyJ3Kyia0e6CsbGU5btBzMsF2kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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