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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e509ea073bf2a7b54c82f33e80b38be247ed70484abbaaf034604b68535e0f96' 
  AND token = '5o5IiECgLeTM9a+//eVgHNnWnIILJRu6hfpcIoLMctY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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