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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6250c8a330be47be56e6077a16e26f499447051c7012328307319f7c8d942ef1' 
  AND token = 'VgEden85jbPsbDHgl2CWE2UGN2kvxCmlrHTJ3J/6KKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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