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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e98b6947d6cdfd88fafec4267a7227faca5f226a64eae3ec53d82b830ae647' 
  AND token = '7dzh6GEj/5IR4Fg58sHhvCLAeUf2peaq5GNxn8m3rsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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