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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bac542200e0d235ebedd6ad7fa26cd1a3e9246cff4e50c9236c33612d99cca' 
  AND token = 'kYoOlQvEWo0JgRXs4vKACfNruN6QMSoD1pN6ES/ZoL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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