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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168596af0a186499b672c5832dff8d719f07403eb6773d24cc6d8d08d977e0bf' 
  AND token = 'm15NGNdfAiXekHzNhFflE6UNNvj85pY4nqRpvuvyhBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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