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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c8c7d39b6705e134a96f3a8b119c466399d3cab0a62b7ac0288655002dcdfa' 
  AND token = 'Xilvkndk6rikvarDVy/70gJbn1v8bUwgjgkoF8g8LmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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