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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b2b5be31c66e5b5d0932997a091d46499aac65d98177fe2e86f6cee4fdf03e' 
  AND token = 'dCd29OfAhIxx3QHovCFZu0Dh5WOLlNeAzDao53HxQe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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